Search Results

Search found 32994 results on 1320 pages for 'second level cache'.

Page 307/1320 | < Previous Page | 303 304 305 306 307 308 309 310 311 312 313 314  | Next Page >

• Does learning a functional language make a better OOP programmer?

  - by GavinH

  As a Java/C#/C++ programmer I hear a lot of talk about functional languages, but have never found a need to learn one. I've also heard that the higher level of thinking introduced in functional languages makes you a better OOP/procedural language programmer. Can anyone confirm this? In what ways does it improve your programming skills? What is a good choice of language to learn with the goal of improving skills in a less sophisticated language?

  Read the article

• Stacks in C++

  - by MarkPearl

  So some more basics… One of the things you will be taught at any college after conquering arrays is different derivatives of collections. Stack is one of the simplest of those and very useful… A stack is a LIFO (last in first out) data structure and has at least two basic method calls – push & pop. Push, “pushes” an item on the top of the stack. Pop, removes the top most item off the stack. Because all elements on a stack are of the same type, one can use an array to implement a stack or a linked list. With the array based approach, the first element in a stack would be the first element in the array, the second on the stack would be the second on the array, etc. One limitation with an array implementation of a stack is that unless the array is dynamic, one would have to have a preset max stack size (based on the bounds of the array). Linked lists is another approach that gets past this boundary by allowing you to dynamically grow or shrink a collection of data. Stacks have many applications… a typical computer science example would be Postfix Expression Calculator, where the LIFO principle is maintained.

  Read the article

• Why does 301 redirect work for http but not for https?

  - by Tom G

  Through my domain registrar I have set up a domain, essayme.co.uk, to automatically forward to https://google.com. If I go to http://essayme.co.uk it works as expected and redirects me to https://google.com. $curl -i http://essayme.co.uk HTTP/1.1 301 Moved Permanently Cache-Control: max-age=900 Content-Type: text/html Location: https://google.com Server: Microsoft-IIS/7.5 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Sat, 07 Jun 2014 11:14:16 GMT Content-Length: 0 Age: 0 Connection: keep-alive However, if I go to https://essayme.co.uk it just freezes and times out. $curl -i https://essayme.co.uk curl: (7) Failed connect to essayme.co.uk:443; Operation timed out What is happening in the second case? (and, if possible, how can I get the redirect to work for https?) Problem background/clarification: I don't have an SSL certificate for the essayme.co.uk domain above, but I do for my live domain (let's call it mywebsite.com), and I was seeing the exact same problem on this domain (hence why I'm trying to debug the problem). Unfortunately I can't experiment with the live domain (as it's live) and I would like to avoid having to buy a second certificate for essayme.co.uk just for debugging (unless absolutely necessary). The problem I was seeing: my live domain, mywebsite.com (not its real name), has a valid SSL certificate. Visiting https://www.mywebsite.com displayed the webpage as expected. I had set up forwarding (like in the question above) from the naked domain (mywebsite.com) to https://www.mywebsite.com) Visiting http://mywebsite.com redirected to https://www.mywebsite.com as expected. However, visiting https://mywebsite.com would freeze and time out (as in the question above). I also tried forwarding it to http://www.otherwebsite.com as an experiment (i.e. forwarding to another site that does not use SSL), but the result was the same: Visiting http://mywebsite.com redirected to http://www.otherwebsite.com as expected. Visiting https://mywebsite.com would freeze and time out again. So I set up essayme.co.uk as an experiment to try and understand why it doesn't work.

  Read the article

• How to unit test with lots of IO

  - by Eric

  I write Linux embedded software which closely integrates with hardware. My modules are such as : -CMOS video input with kernel driver (v4l2) -Hardware h264/mpeg4 encoders (texas instuments) -Audio Capture/Playback (alsa) -Network IO I'd like to have automated testing for those functionalities, such as integration testing. I am not sure how I can automate this process since most of the top level functionalities I face are IO bound. Sure, it is easy to test functions individually, but whole process checking means depending on tons of external dependencies only available at runtime.

  Read the article

• How to diagnose Ubuntu CPU spikes / IO wait?

  - by Jeff Welling

  I'm using Ubuntu and every couple minutes it goes unresponsive for a half second to a full second, which isn't normally a problem but makes trying to code extremely frustrating when your trying to hit backspace or navigate the code and nothing is happening. The problem is, the freezes are so brief that top doesn't have time to show me what is spiking the CPU (assuming something is, but I don't know what else could cause this). Does anyone know how to troubleshoot this performance issue? Edit: I've tried login in with Gnome Classic (No Effects) instead of Unity but it still freezes up every once in awhile. Edit: The CPU graph doesn't seem to be showing any actual spikes so it seems you were right and my original diagnosis of CPU spikes being the problem was incorrect, I now suspect IO wait. I don't recall this happening for the brief few weeks I had Windows 7 Starter running on it though, which leads me to believe it isn't (just?) the hardware.. is there anything I can tweak to improve this? I'm using an Acer Aspire One D257, with Ubuntu 11.10. Edit: Output of dmesg is at http://paste.ubuntu.com/1060054/ and kern.log is at http://paste.ubuntu.com/1060055/

  Read the article

• Setting up dual wireless routers

  - by JasCav

  I have two wireless routers (one is the router supplied by Verizon - MI424-WR ActionTek and the other is DD-WRT Buffalo router). I want to set them up so that I have the second router (Buffalo) on its own subnet and two SSIDs so I can put different devices on different routers and so I can put my web server on the first router and put most of my other computers behind the second router for a little extra protection in case of a compromise. From my understanding, I have to hook the two routers together so that the LAN from the Verizon router plugs into the WAN port of the Buffalo router. This is where I get stuck. What settings do I need to look for to setup the Buffalo on its own subnet? Do I need to do anything with the Verizon router, or are the configuration changes done to the Buffalo?

  Read the article

• opening and closing connection with port happening fastly

  - by michale

  We have a Main application named "Trevor" installed in 2008R2 machine named "TEAMER12" which is slow now. One more application named "TVS" also running in and found there were many connections per second occurring to port 5009. netstat tool mentions that some fast connection open/close seen for port 5009 So first it will be listening mode like shown below TCP 0.0.0.0:5009 TEAMER12:0 LISTENING then establishes connection like TCP 127.0.0.1:5009 TEAMER12:49519 ESTABLISHED TCP 127.0.0.1:5009 TEAMER12:60903 ESTABLISHED After that iwill become TIME_WAIT and i could see several entries like shown below TCP 127.0.0.1:49156 TEAMER12:5009 TIME_WAIT after that it will establish connection like TCP 127.0.0.1:60903 TEAMER12:5009 ESTABLISHED TCP 127.0.0.1:64181 TEAMER12:microsoft-ds ESTABLISHED again it will go several entries like TIME_WAIT TCP 127.0.0.1:49156 TEAMER12:5009 TIME_WAIT Finally it will establish like this TCP 172.26.127.40:139 TEAMER12:0 LISTENING TCP 172.26.127.42:139 TEAMER12:0 LISTENING TCP 172.26.127.42:5009 TEAMER12:64445 ESTABLISHED TCP 172.26.127.42:64445 TEAMER12:5009 ESTABLISHED Can any body tell me whats the reason behind why many connections per second occurring to port 5009 and why application slow?

  Read the article

• Battery is drained too quickly

  - by LucaB

  I'm getting really low battery life under ubuntu, not even close to windows. I tried powertop, and I saw that my laptop is consuming in idle nearly 20 watts (a bit more). I tried to install laptop-mode-tools, change "good" into "bad" in powertop, but nothing changes. I see that I have the the HD audio output device which is running at 100% every time. Could this be the problem? This is a report from powertop. The battery reports a discharge rate of 22.8 W The estimated remaining time is 33 minutes Summary: 381.8 wakeups/second, 0.0 GPU ops/second and 0.0 VFS ops/sec Usage Events/s Category Description 3.2 ms/s 182.7 Timer tick_sched_timer 100.0% Device Audio codec hwC0D3: Intel 7.9 ms/s 25.1 Process /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background no 1.9 ms/s 24.2 Interrupt [6] tasklet(softirq) 2.9 ms/s 23.2 Process /usr/lib/chromium-browser/chromium-browser --type=zygote 8.1 ms/s 20.3 Process /usr/lib/unity/unity-panel-service 0.7 ms/s 17.4 Timer hrtimer_wakeup 4.2 ms/s 12.6 Process unity-2d-panel 604.4 µs/s 9.7 Process syndaemon -i 2.0 -K -R -t 149.7 µs/s 9.7 kWork ieee80211_iface_work 0.8 ms/s 8.7 Process metacity 19.5 ms/s 1.0 Process powertop 3.0 ms/s 6.8 Process //bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session 699.0 µs/s 6.8 Process /usr/lib/thunderbird/thunderbird 4.3 ms/s 4.8 Process gnome-terminal 658.9 µs/s 2.9 Interrupt [1] timer(softirq) 75.1 µs/s 2.9 kWork iwl_bg_run_time_calib_work 163.8 µs/s 1.9 Process /usr/lib/accountsservice/accounts-daemon 70.6 µs/s 1.9 Process [ksoftirqd/2] 25.8 µs/s 1.9 Process [ksoftirqd/0] 1.0 ms/s 1.0 Process /usr/bin/python /usr/sbin/powernapd 408.2 µs/s 1.0 Process unity-2d-shell 189.8 µs/s 1.0 Process /usr/lib/chromium-browser/chromium-browser 124.4 µs/s 1.0 Process /usr/lib/unity-lens-applications/unity-applications-daemon 113.3 µs/s 1.0 Process /usr/lib/gnome-settings-daemon/gnome-settings-daemon 112.0 µs/s 1.0 Process nautilus -n 104.9 µs/s 1.0 Process /usr/lib/gvfs/gvfsd-trash --spawner :1.2 /org/gtk/gvfs/exec_spaw/0 77.5 µs/s 1.0 Process /usr/lib/x86_64-linux-gnu/colord/colord 75.6 µs/s 1.0 Process /usr/lib/gvfs/gvfs-gdu-volume-monitor 75.0 µs/s 1.0 Interrupt [53] i915 74.9 µs/s 1.0 Process /usr/lib/gvfs/gvfs-afc-volume-monitor What should I do to make the battery consumption lower?

  Read the article

• Recursive Batch File

  - by MCZ

  I have a file that looks this: head1,head2,head3,head4,head5,head6 a11,a12,keyA,a14,a15,a16 a21,a22,keyB,a24,a25 a31,a32,keyC,a34 a41,a42,keyB,a44,a44 a51,a52,keyA,a54,a55,a56 a61,a62,keyA,a64,a65,a66 a71,a72,keyC,a74 some message Objective: Write list of unique keys to a text file. For example, the result for the file described above should be: keyA, keyB, keyC Here's the pseudocode I would like to implement in batch file recur.bat Read second line of inputfile If no key exist on second line, return else continue Append keyX to list FINDSTR /v keyX inputfile Pipe results to recur.bat I don't know if this is the most efficient way to do this without using actual programming language. Any suggestions for actual batch file code?

  Read the article

• How to make an object move again after being stopped by collision in Unity?

  - by Matthew Underwood

  I have a player object which position is always centered on the main camera's viewport. This object has a Rigidbody 2D, a box and circle collider. The player moves around a level, the level has a polygon collider attached. I move the camera until the object hits against the collider, which stops the movement of the camera by setting its speed to 0. The problem happens when I want to move the camera / player object away from the collider. As the speed is already at 0, it cannot move away from the collider. The script attached to the player object, checks for collisions and applies the speed to 0 on the main camera's test script. using UnityEngine; using System.Collections; public class move : MonoBehaviour { public float speed; public test testing; // Use this for initialization void Start () { speed = 10F; testing = Camera.main.GetComponent<test>(); } // Update is called once per frame void FixedUpdate () { Vector3 p = Camera.main.ViewportToWorldPoint(new Vector3(0.5F, 0.5F, Camera.main.nearClipPlane)); transform.position = new Vector3(p.x, p.y, -1); } void OnCollisionEnter2D(Collision2D col) { testing.speed = 0; } void OnCollisionExit2D(Collision2D col) { testing.speed = 10F; } } This is the script attached to the main camera; just a simple script that changes the camera's position. using UnityEngine; using System.Collections; public class test : MonoBehaviour { public float speed; public float translationY; public float translationX; // Use this for initialization void Start () { speed = 10F; } void FixedUpdate () { translationY = Input.GetAxis("Vertical") * speed * Time.deltaTime; translationX = Input.GetAxis("Horizontal") * speed * Time.deltaTime; transform.Translate(translationX, translationY, 0); } } The player object isn't kinematic and is a fixed angle, the colliders aren't triggers and the polygon collider isn't a trigger either. The player is the red square, the collider is the pink area. -- EDIT -- From the latest change the collider set up for the player So if the X speed was disabled. It wouldnt move into the side of the polygon colider which is good, but yet you couldnt move away from it. And moving down would move inside the colider.

  Read the article

• Running Emacs on Multiple TTYs in screen

  - by Daniel Kessler

  When working with EMACS over SSH, is there any way to spawn a new frame of the same emacs session on a different terminal? In my use case, I have screen running, so I have multiple terminals, and can recover which pseudo terminal they're attached to with pts. Suppose I have two "windows" (in GNU screen parlance). The first one is attached to /dev/pts/12 and the second one is attached to /dev/pts/13. I launch emacs on the first window. Is there any way for me to start a new frame of the same session on the second window? I've been playing with passing arguments to make-frame but it seems that the usage that allows me to specify a terminal requires that a terminal object already exists, and I can't see any way to create a new terminal object.

  Read the article

• ISO 12207: Verification of integration and Unit test validation

  - by user970696

  I have received comments from the supervisor reviewing my thesis. He asked two questions I cannot answer right now: If ISO 12207 says under "Integration verification" that it "checks that components are correctly and completely integrated into a system", how this can be verified without testing, if all testing is validation? How without testing can I know that system is integrated correctly and fully? If unit testing is validation, how does it match the ISO definiton of validation "that requirements for intended use were fulfilled" if its so low level?

  Read the article

• APress Deal of the Day 4/Jan/2011 - Pro SQL Server 2008 Mirroring

  - by TATWORTH

  Todays Apress $10 deal of the day at http://www.apress.com/info/dailydeal is "Pro SQL Server 2008 Mirroring is your complete guide to planning, using, deploying, and maintaining database mirroring as a high-availability option. Mirroring protects you by maintaining one or more duplicate copies of your database for use in the event the primary copy is damaged. It is a key component of any production-level, high-availability solution. This book covers the full spectrum of database mirroring, taking you from the planning phase through the implementation to the maintenance phase and beyond."

  Read the article

• Why don't windows of the same application behave as they should?

  - by Yuttadhammo

  Somewhere along the upgrade path, Unity has developed some strange logic behind window layering. First, before Oneiric, there was a way to see all the windows of an application - I think it was when you click on the icon in the launcher. Now, clicking on the icon often does nothing. Suppose I have two terminals open, one behind this Firefox window, and one in front of it. Clicking on the launcher does nothing - the only way to find the second terminal, afaics, is to move the Firefox window or use the task switcher. Secondly, once I have both terminals on top, then I decide to close one of them, suddenly they both disappear (the second one, for some reason, has gone into hiding behind the Firefox window). Third (though I can't pin it down now), sometimes when a window is on top, focus is still on a window in back; I click on the top x to close the window in front, only to find I've closed an important window in the back. (Update: this question details the problem) I can't really believe these are bugs, since they seem too obvious to not have been fixed by now. My question is, am I missing something? Some compiz option I can set to make it act like it used to? Or is this really how Unity is supposed to act?

  Read the article

• How Cloud Computing Security Resembles the Financial Meltdown

  <b>Datamation:</b> "How do you know if a cloud computing vendor is secure? When they make claims about their nearly absolute level of safety, should you just...take their word for it? "

  Read the article

• Creating floppy drive special devices under Quantal

  - by JCCyC

  First, I'd like for the various special devices for different floppy capacities (like /dev/fd0u720 etc.) to be available. I tried to adapt some udev rules I found online. I tried this, which I saved as /etc/udev/rules.d/70-persistent-floppy.rules: # change floppy device ownership and permissions # default permissions are 640, which prevents group users from having write access # first fix primary devices (/dev/fd0, /dev/fd1, etc.) # also change group ownership from disk to floppy SUBSYSTEM=="block", KERNEL=="fd[0-9]*", GROUP="floppy", MODE="0660" # next recreate secondary devices (/dev/fd0u720, /dev/fd0u1440, etc.) SUBSYSTEM=="block", KERNEL=="fd[0-9]*", ACTION=="add", RUN+="create_floppy_devices -c -t $attr{cmos} -m %M -M 0660 -G floppy $root/%k" But to no avail. It seems the create_floppy_devices script isn't provided with 12.10. How do I obtain it? Second: I'm using MATE, and whenever I log in I get a message box saying it tried to mount the drive but failed. How do I disable this? Third (which is probably related to the second): Whenever there's a disk in the drive, the motor won't stop spinning. If I do a mdir of it, after it returns, the motor stops, and then starts again. I suspect there's some process in MATE doing this. UPDATE: For CentOS 6 (who does have a create_floppy_devices program) the following rules file worked. Saved as /etc/udev/rules.d/98-floppy.rules: # change floppy device ownership and permissions # default permissions are 640, which prevents group users from having write access # first fix primary devices (/dev/fd0, /dev/fd1, etc.) # also change group ownership from disk to floppy KERNEL=="fd[0-9]*", GROUP="floppy", MODE="0660" # next recreate secondary devices (/dev/fd0u720, /dev/fd0u1440, etc.) # drive A: is type 4 (1.44MB) - add other lines for other drives KERNEL=="fd0*", ACTION=="add", RUN+="/lib/udev/create_floppy_devices -c -t 4 -m %M -M 0660 -G floppy $root/%k"

  Read the article

• two samba servers and one ldap backend

  - by user2346281

  I had setup a Samba 3 server as PDC with a passdb LDAP backend. Server SID: S-1-5-21-3270... Domain: A Every user has a SambaSID beginning with this Server SID. But now I try to setup a second server for some shares. This server should use the same LDAP backend because I don't want to have two LDAP backends. Otherwise I have to do modifcations (e.g. add users) twice. Second Server SID: S-1-5-21-3797... Domain: B But now when a user try to mount this new share I see this error in samba log: The primary group domain sid(S-1-5-21-3797....) does not match the domain sid(S-1-5-21-3270...) for xxx(S-1-5-21-3270...). I understand the problem but what can I do to avoid to maintain two LDAP backends? Regards, Simon

  Read the article

• Multi Gateway and Backup Routing on a cisco router

  - by user64880

  Hi all, I have a 2611 Cisco Router with only one Fastethernet port Now I have two internet gateways. I want to config my router as when primary routing fails second routing automatically start to route all my packets. When I set 2 IP route command in my router then I check I see it work well but when peer IP on primary routing is down it can not change to second routing until I remove first route command.In the following I write my setting. How can I set it? interface FastEthernet0/0 ip address 81.12.21.100 255.255.255.248 secondary ip address 62.220.97.14 255.255.255.252 ip route 0.0.0.0 0.0.0.0 62.220.97.13 ip route 0.0.0.0 0.0.0.0 81.12.21.97 100 Cheer, Kamal

  Read the article

• Linux AI robot baby dinosaur

  <b>Handle With Linux:</b> "Watch this: a Linux powered baby dinosaur, with a arm processor heart. The robot runs Live OS. An embedded, linux based operating system which features a custom programming language, giving the possibility to interact with the robot on the programming level"

  Read the article

• Dedicated Mouse and Keyboard on VirtualBox VM

  - by Myersguy

  Currently I am trying to run VirtualBox on my second monitor, with a dedicated mouse and keyboard. However, doing so has not proven easy. There has been times where the mouse works, but not the keyboard, vice versa, or nothing works at all. The biggest problem I am running into is this: When enabling the USB mouse and keyboard from the VM, I get an error: 'USB Device is busy with a previous request.' The only thing that is using second mouse and keyboard, however, is Windows. The other error I have received stated that the VM was unable to create a proxy for the device. Additionally, the VM occasionally will disable the secondary keyboard entirely, requiring me to unplug and replug it into my PC to re-enable it again. Keyboard auto-capture is disabled, and while a solution I was reading online stated to turn off mouse integration, that option is grayed out on my machine.

  Read the article

• Architecture a for a central renderer rather than self-rendering

  - by The Communist Duck

  For the architectural side of rendering, there's two main ways: having each object render itself, and having a single renderer which renders everything. I'm currently aiming for the second idea, for the following reasons: The list can be sorted to only use shaders once. Else each object would have to bind the shader, because it's not sure if it's active. The objects could be sorted and grouped. Easier to swap APIs. With a few macro lines, it can be easy to swap between a DirectX renderer and an OpenGL renderer (not a reason for my project, but still a good point) Easier to manage rendering code Of course, if anyone has strong recommendations for the first method, I will listen to them. But I was wondering how make this work. First idea The renderer has a list of pointers to the renderable components of each entity, which register themselves on RenderCompoent creation. However, I'm worrying that this may end up as a lot of extra pointer weight. But I can sort the list of pointers every so often. Second idea The entire list of entities is passed to the renderer each render call. The renderer then sorts the list (each call, or maybe once?) and gets what it wants. That's a lot of passing and/or sorting, however. Other ideas ??? PROFIT Anyone got ideas? Thank you.

  Read the article

• Excel sum from column based on another column

  - by jsmars

  I have two columns. The values in the first one are either blank or have a 1. The values in the second one is a number. I also have a variable field. At the bottom of each column, I'd like to have a "total" field, which checks if there is a value (of 1) in the first column, and if there is, adds this up from the value of the second column (on the same row) and multiplies it by the variable. for example: variable 10 name1 name2 counter 1 2 1 3 1 1 3 1 4 totals 100 50 since name1 has 3 1's in it's column, it takes each value from the counter column, and multiplies it by the variable, and outputs the total I'm sorry if this has been asked, I've tried searching but I have a hard time understanding the excel syntaxes. Thanks!

  Read the article

• How can I plot a radius of all reachable points with pathfinding for a Mob?

  - by PugWrath

  I am designing a tactical turn based game. The maps are 2d, but do have varying level-layers and blocking objects/terrain. I'm looking for an algorithm for pathfinding which will allow me to show an opaque shape representing all of the possible max-distance pixels that a mob can move to, knowing the mob's max pixel distance. Any thoughts on this, or do I just need to write a good pathfinding algorithm and use it to find the cutoff points for any direction in which an obstacle exists?

  Read the article

• How do I set up different configurations on an Ubuntu laptop based on different physical locations?

  - by Andrew Larned

  I'm looking for a way to have a couple (or three) multiple configurations set up on my laptop, and easily switch between them. To be more specific, when my laptop is at work, it's plugged into a second monitor, and has a specific set of networks configurations. At home, the second monitor is gone, the network configurations are different. At a public wireless point there are other configurations to set, etc. I know I can go into my preferences and turn on/turn off the monitor, and mess with the networking preferences, and so on, but I'm looking for a way to change a bunch of preferences all at once, and if it's possible to do that automatically, maybe based on the wireless APs in the vicinity, that would be even better.

  Read the article

• Windows Server 2008: Limit UDP/TCP packets per IP or ban

  - by WBAR

  How I can limit UDP/TCP packets per IP send to my host (or better PORT) per second or minute ? Would be nice to ban that IP for 12/24 hours or even for ever. I got Windows Server 2008 and I'm very poor in Windows administration but quite good in Linux. EDIT: By basic problem is that They sending a lot of rubbish UPD and TCP packets.. TCP packets without SYNCH, fragmented UDP packets so my servers stop responding.. So I need to cut off users (IPs) sending more than X packets per second. I need solution witch provides me, somehow, configurable: X packets of certain type (UDP, TCP or both - lets say parameter named Z ) are allowed to be received by IP on Y port, otherwise this packet should be DROPPED. My virtual hosts are hosted by VirtualBox and I'm able to forward all incoming packets certain type and certain port to the specific Virtual Host, but I need to DROP them before my VirtualBox receive them.

  Read the article

< Previous Page | 303 304 305 306 307 308 309 310 311 312 313 314  | Next Page >